Welding-torch.



s. H. TOLMAN.

WELDING TORCH.

APPLlCATION FILED JULY 15. 1913.

l 9 1% 1 fifig, I Patented June 1, 1915:

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4 SCOTT H. TOLMAN, 0F, BOSTON, MASSACHUSETTS.

' WELDING-TORCH.

Be it known that 1, Soon H. TOLMAN, a citizen of the United States, and resident of Boston, in the county of Suffolk and Stateof Massachusetts, have invented certain -new and useful Improvements in WVelding-Torches, of which the following is a specification.

This invention relates to welding torches,

and it consists in certain features of construction and arrangement, hereinafter ex plained, whereby leaking at the joints is prevented, flare-backs may be quickly dis- ,peiled,oand the gases efliclently mixed.

Of the accompanying drawings, which illustrate one form in which-the invention may be embodied: Figure 1 represents, in section, the head, tip, and mixing means of a welding torch. Fig. 2 represents a side elevation, on a smaller scale, of such a torch. Fi g. 3 represents a section of the head alone.

i Fig. 4 represents a section of the mixing means. Fig. 5 represents an elevation of the rear end of the tip.

The same reference characters indicate thesame parts whereverthey occur. v The torch, as shown by Fig. 2, is intended to be held inthe hand of the user, and comprises a handle 10, head 11, tip 12, and

gas pipes 13 and 14:, all connected according to well-known arrangement.

The head 11 is bored and tapped for the reception of screw-threaded ends of the pipes 13 and 1 1. The head is also bored to provide a chamber 15, and is tapped as indicated at 16 for the reception of the screw threaded portion 17 of the tip 12. Passageways 18 and 19 conduct the gases from the pipes 13 and 14. respectively to the mixing means contained in the chamber 15. The

mixing means consists in unplug 20 (see Fig. 1), said plug having passageways by which the gases are brought together before they enter the tip. The plug 20 is preferably of such diameter as to fit tightly against the cylindric Wall of the chamber 15, so that it is necessary to force the plug into the chamber; and when the plug is driven to the desired position, it fits so tightly as to prevent leaking of gas be tween its periphery and the wall of the chamber.

The plug 20 has a longitudinal passageway 21 which registers with the passage-- Way '18. The tip 12 has a longitudinal passageway 22' wh1ch registers with the pas- Speeiflcation of Letters Patent.

Patented June 1, 1915.

Application filed July 15, 1913. Serial No. 779,159.

sageway 21 of the plug, the passageways 18, 21 and 22 being, to all intents and purposes, one continuous passageway for the gases.

The head, the plug and the tip are all arranged in abutting end-tdend relation. A gas-tight joint between the abutting portions of the head and plug is efiected by providing one of the members with a partially spherical face. In the present in stance this face, indicated at 23, is formed upon the plug. The face 23 abuts against the surface 24 of the head and touches the latter only in a circle, the joint being thus limited to circulzrdine contact. The circular contact is coincident with the circumference of the longitudinal passageway.

The joint thus effected is less likely to leak unoccupied, this unoccupied chamber being indicated at 27 in Fig. 1. The gas from the pipe 14 is delivered into this chamber 27 by the passageway 19 and is conducted from, "the chamber by inclined passageways 28 formed in the plug. The delivery ends of the passageways 28 are in the longitudinal passageway 21 between the ends of the latter, and they are preferably, though not necessarily at difierent distances from the delivery end of the passageway 21. Ti..-

reason for this ofiset arrangement is hereinafter explained. .7

The gases commonly used in a welding torch are acetylene and oxygen, these two 7 gases being conducted separately by the pipes 13 and 14 into the head and therein mixed. The practice hitherto has been to conduct the oxygen to therear end of the central longitudinal passageway in the head, as at 18, and to admit the acetylene into the longitudinal central passageway between the ends of the latter. I have found in actual practice that flarebacks occur less freuently by reversing this order of admitting the gases, and for this reason 1 prefer to admit the acetylene through pipe 1.3 and the oxygen through the pipe 14:. has also been customary hitherto to provide the acetrylene supply pipe with a. stopcock. I pre er, however, to arrange a stopcock in the oxygen supplypipe, and have shown such a cock at 29 in Fig. 2. This cock is provided with a plunger 30 which may be depressed by the hand grasping the handler: 10, to control the passage of oxygen through the pipe 14. It is immaterial whether the cock be 'open or closed by depressing the plunger, as other valves are customarily provided between the handle 10 and the tral passageway of the plug. It is well known that two streams which meet spread in the form of a sheet, and consequently if the two streams of oxygen from the passageways 28 were to meet in the center of the passageway 21 they would impede the How of the acetylene and prevent the desired volume of acetylene from, flowing through the tip. According to the illustrated arrangement of the passageways 28, the acetylene becomes mixed first with one stream of oxygen and then the combined gases receive an additional supply of oxygen from the other passageway 28, thus effecting a more perfect mixing of the gases and ena--'.ing the desired volume of acetylene to pass through the ti I believe I am the first to provide a p ug for this purpose wherein the gases are brought together and mixed before they reach the delivery end of the plug. I also believe that I am the first to form two abutting members with portions for making a gas-tight joint limited to circular line contact coincident with the periphery of the passageways which conduct the gases.

I claim: 7

1. A welding torch comprising a head, a plug therein and a tip, sald plug being between confronting end faces of said head and tip and havin engagement with said faces, said head an tip1 having interengag ing screw threads w ereby said tip 13 brought to bear with force against said plug, said engagement between said head and plug, and said engagement between said plug and tip being hunted to circular line engagement, said head,'plug and tip having meeting passageways forming one contin-' uous passageway, the circumference of said passageway at the junction of said head and. plug coinciding with such circular line of.

. engagement thereat, andv the circumference of said passageway at the junction of said plug and tip coinciding with such circular line of engagement thereat.

2. A- welding torch comprising a head memberand a pluralityof other members includin a tip member, said members'being arrange in a series and in abutting end. to end relation, said head member and tip member being the end members of such se- Ties and having mterengaging screw-threads wherebysaid tip member may be .bneught to bear with force against the contiguous intermediate member, each of the abutting end faces of all said members bein formed to limit its engagement with the a utting end face of the respective contiguous member to a circular line, said members having lontudinally extending meeting passa eways orminlg one continuous passageway t rou h all sai members, the circumference of sald continuous passageway being coincident.

with such circular line of engagement at each of said abutting faces, a plurality of said members having other passageways the delivery end or ends of which joinsaid continuous passageway between abutting end faces of said members.

In testimony whereof I have aflixed my signature, in presence of two witnesses;

I SCOTT H. TOLMAN.-

Witnesses:

WALTER P. ABELL, P. W. PEZZE'I'IL 

